No. For two reasons.
First, I don't think that person would have the ability to do any significant damage. FR is not nearly as big or as influential as it used to be, and I haven't seen members on either side of the Romney divide whose minds have been changed by this circular firing squad.
Second, having one anti-Romney poster turn out to be a troll would be like having one Tea Party activist turn out to be a racist. Of course, it's possible, but it is not an excuse for a generalized attack.
I have to admit, you make good points.
I reserve the right to dispute them in the future, however.
:)